×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Converting sound level measurements in dbA to db

Converting sound level measurements in dbA to db

Converting sound level measurements in dbA to db

(OP)
Does anyone know how to convert a sound level measurement made in dbA to db?
Where: db = 10log(Io/Ir)
dbA = sound measurement based on the 40 phon weighting curve

RE: Converting sound level measurements in dbA to db

DHZ-

You already have a measurement in dB.

The notation you have denotes a difference in dB from a reference level. The particular reference level is conveyed by the notation: dBA.

If you were to have an loss in your system, say a curtain that absorbed 30 dB of sound, you could subtract that directly from your source level in dBA to get a received level in dBA. This way, you can create a 'link budget', which accounts for all losses and gains in a system to determine your final signal level. This would still be referenced to the orignial level, in this case the 40 phon weighting curve.

The 40 phon weighting curve, is a tough one. The exact energy level varies according to the particular frequency measured. It becomes very complex when a variety of time-varying frequencies, such as are found in speech, are measured at the same time.

Also note that the proper notation is "dB". The "B" refered to is Alexander Graham Bell. Since it is a proper name, it should be capitalized. You may need to turn off the capitalization checker of your spell check (or put up with it), to write good memos.

-Joe

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

eBook - Efficient and Effective Production Support with 3D Printed Jigs and Fixtures
Jigs and fixtures offer manufacturers a reliable process for delivering accurate, high-quality outcomes, whether for a specific part or feature, or for consistency across multiples of parts. Although the methodologies and materials for producing jigs and fixtures have evolved beyond the conventional metal tooling of years past, their position as a manufacturing staple remains constant due to the benefits they offer. Download Now
Overcoming Cutting Tool Challenges in Aerospace Machining
Aerospace manufacturing has always been on the cutting edge, from materials to production techniques. However, these two aspects of aerospace machining can conflict, as manufacturers strive to maintain machining efficiency with new materials by using new methods and cutting tools. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close